U.S. patent number 10,800,946 [Application Number 15/831,641] was granted by the patent office on 2020-10-13 for display apparatus.
This patent grant is currently assigned to SAMSUNG DISPLAY CO., LTD.. The grantee listed for this patent is SAMSUNG DISPLAY CO., LTD.. Invention is credited to Jee-Na Lee, Jieun Nam, Young-Min Park.
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United States Patent |
10,800,946 |
Park , et al. |
October 13, 2020 |
Display apparatus
Abstract
A display apparatus includes a display panel, a light guide unit
disposed under the display panel that includes a light incident
surface, an opposite surface opposite to the light incident
surface, side surfaces connecting the light incident surface and
the opposite surface, and a light exiting surface facing the
display panel, and a foam tape attached on an edge of the light
exiting surface and an edge of a lower surface of the display panel
to fix the display panel and the light guide unit. The foam tape
includes a first adhesive layer, a reflecting layer disposed on the
first adhesive layer, a foam layer disposed on the reflecting
layer, and a second adhesive layer disposed on the foam layer and
attached to the display panel.
Inventors: |
Park; Young-Min (Hwaseong-si,
KR), Lee; Jee-Na (Anyang-si, KR), Nam;
Jieun (Seoul, KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
SAMSUNG DISPLAY CO., LTD. |
Yongin-si, Gyeonggi-do |
N/A |
KR |
|
|
Assignee: |
SAMSUNG DISPLAY CO., LTD.
(Yongin-si, Gyeonggi-Do, KR)
|
Family
ID: |
1000005116220 |
Appl.
No.: |
15/831,641 |
Filed: |
December 5, 2017 |
Prior Publication Data
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|
|
|
Document
Identifier |
Publication Date |
|
US 20190016926 A1 |
Jan 17, 2019 |
|
Foreign Application Priority Data
|
|
|
|
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Jul 17, 2017 [KR] |
|
|
10-2017-0090508 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C08J
5/18 (20130101); G02B 6/0073 (20130101); G02B
6/0088 (20130101); C09J 7/38 (20180101); G02B
6/0023 (20130101); G02F 1/133308 (20130101); G02F
2001/133614 (20130101); G02F 2203/02 (20130101); C09J
2301/302 (20200801); C09J 2203/318 (20130101); G02F
2001/133388 (20130101); C09J 2301/40 (20200801); G02F
1/133615 (20130101); G02F 2202/28 (20130101); G02B
6/005 (20130101); G02B 6/0068 (20130101) |
Current International
Class: |
C09J
7/38 (20180101); C08J 5/18 (20060101); F21V
8/00 (20060101); G02F 1/1333 (20060101); G02F
1/13357 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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10-2013-0098717 |
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Sep 2013 |
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KR |
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10-2014-0103502 |
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Aug 2014 |
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KR |
|
10-1724760 |
|
Apr 2017 |
|
KR |
|
20180057942 |
|
May 2018 |
|
KR |
|
20190043188 |
|
Apr 2019 |
|
KR |
|
20190058761 |
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May 2019 |
|
KR |
|
Other References
Machine English Translation of KR20190043188A; Seo Ji Sang (Year:
2019). cited by examiner .
Machine English Translation of KR20190058761A; Hyun min Gwan (Year:
2019). cited by examiner .
Machine English Translation of KR20180057942A, Han Sang Dae (Year:
2018). cited by examiner.
|
Primary Examiner: Akanbi; Isiaka O
Assistant Examiner: Zimmerman; Glenn D
Attorney, Agent or Firm: F. Chau & Associates, LLC
Claims
What is claimed is:
1. A display apparatus, comprising: a display panel; a light guide
unit disposed under the display panel that includes a light
incident surface, an opposite surface opposite to the light
incident surface, side surfaces connecting the light incident
surface and the opposite surface, and a light exiting surface
facing the display panel; and a foam tape attached onto an edge of
the light exiting surface and an edge of a lower surface of the
display panel to fix the display panel and the light guide unit,
wherein the foam tape comprises a first adhesive layer, a
reflecting layer disposed on the first adhesive layer, a foam layer
disposed on the reflecting layer, and a second adhesive layer
disposed on the foam layer and attached to the display panel,
wherein the foam tape comprises a first foam tape, a second foam
tape, and a third foam tape, wherein one or more of the first foam
tape, the second foam tape, or the third foam tape further
comprises a blue layer disposed between the reflecting layer and
the first adhesive layer, and the blue layer of the first foam tape
absorbs yellow light.
2. The display apparatus of claim 1, wherein the first foam tape is
attached on an edge of the light exiting surface adjacent to the
opposite surface, the second foam tape and the third foam tape are
attached on edges of the light exiting surface adjacent to the side
surfaces of the light guide unit, respectively.
3. The display apparatus of claim 1, further comprising: a light
source part that emits light and faces the light incident surface
of the light guide unit, wherein light emitted from the light
source part is guided by the light guiding unit and provided to the
display panel; and an optical sheet disposed between the display
panel and the light guide unit, wherein the light source part
comprises a first light source and a second light source arranged
in a direction in which the light incident surface extends, each of
the first and second light sources comprises a light emitting
diode, a phosphor layer disposed between the light emitting diode
and the light incident surface that includes a phosphor, and a body
that receives the light emitting diode and the phosphor layer, the
light emitting diode is located at a position shifted from a center
of the body, each of the first and second light sources comprises a
first lead frame and a second lead frame, and the light emitting
diode is disposed on the second lead frame.
4. The display apparatus of claim 1, wherein the foam tape further
comprises a film base layer between the reflecting layer and the
foam layer, and a protective layer disposed between the foam layer
and the second adhesive layer.
5. The display apparatus of claim 1, wherein the reflecting layer
comprises a material that causes diffuse reflection or specular
reflection.
6. The display apparatus of claim 1, further comprising a
reflecting sheet attached on the side surfaces and the opposite
surface of the light guide unit.
7. The display apparatus of claim 1, wherein the display panel
comprises a display area and a peripheral area that surrounds the
display area, and the foam tape is disposed to overlap the
peripheral area.
8. The display apparatus of claim 1, wherein the foam layer is
black.
9. The display apparatus of claim 2, wherein the foam tape further
comprises a fourth foam tape, and the fourth foam tape is attached
on an edge of the light exiting surface adjacent to the light
incident surface.
10. A display apparatus, comprising: a display panel; a light guide
unit disposed under the display panel that includes a light
incident surface, an opposite surface opposite to the light
incident surface, side surfaces connecting the light incident
surface and the opposite surface, and a light exiting surface
facing the display panel; and a foam tape disposed between the
display panel and the light guide unit, and attached on the display
panel and the light guide unit, wherein the foam tape comprises a
first foam tape, a second foam tape, and a third foam tape, the
first foam tape is attached on an edge of the light exiting surface
adjacent to the opposite surface, the second foam tape and the
third foam tape are attached on edges of the light exiting surface
adjacent to the side surfaces of the light guide unit,
respectively, wherein the foam tape comprises a first adhesive
layer, a reflecting layer disposed on the first adhesive layer, a
foam layer disposed on the reflecting layer, and a second adhesive
layer disposed on the foam layer and attached to the display panel,
wherein one or more of the first foam tape, the second foam tape,
or the third foam tape further comprises a blue layer which absorbs
yellow light and disposed between the first adhesive layer and the
reflecting layer.
11. The display apparatus of claim 10, wherein the foam layer is
black.
12. The display apparatus of claim 10, wherein the reflecting layer
comprises a material that causes diffuse reflection or specular
reflection.
13. The display apparatus of claim 10, wherein the display panel
comprises a display area and a peripheral area surrounding the
display area, and the foam tape is disposed to overlap the
peripheral area.
14. The display apparatus of claim 10, further comprising: a light
source part that emits light and faces the light incident surface
of the light guide unit, wherein light emitted from the light
source part is guided by the light guiding unit and provided to the
display panel; and an optical sheet disposed between the display
panel and the light guide unit, wherein the light source part
comprises a first light source and a second light source arranged
in a direction in which the light incident surface extends, each of
the first and second light sources comprises a light emitting
diode, a phosphor layer disposed between the light emitting diode
and the light incident surface that includes a phosphor, and a body
that receives the light emitting diode and the phosphor layer, the
light emitting diode is located at a position shifted from a center
of the body, each of the first and second light sources comprises a
first lead frame and a second lead frame, and the light emitting
diode is disposed on the second lead frame.
15. The display apparatus of claim 10, wherein the foam tape
further comprises a fourth foam tape, and the fourth foam tape is
attached on an edge of the light exiting surface adjacent to the
light incident surface.
16. The display apparatus of claim 10, further comprising a
reflecting sheet attached on the side surfaces and the opposite
surface of the light guide unit.
17. The display apparatus of claim 11, wherein the foam tape
further comprises a film base layer between the reflecting layer
and the foam layer, and a protective layer disposed between the
foam layer and the second adhesive layer.
Description
The present application claims priority under 35 U.S.C. .sctn. 119
from, and the benefit of, Korean Patent Application No.
10-2017-0090508, filed in the Korean Intellectual Property Office
on Jul. 17, 2017, the contents of which are herein incorporated by
reference in their entirety.
BACKGROUND
1. Technical Field
Exemplary embodiments of the inventive concept are directed to a
display apparatus. More particularly, exemplary embodiments of the
inventive concept are directed to a display apparatus that includes
a light guide unit and a display panel.
2. Discussion of the Related Art
A cathode ray tube (CRT) display apparatuses have been used due to
their performance and competitive prices. However CRT display
apparatuses are large and lack portability. Therefore, display
apparatuses, such as plasma display apparatuses, liquid crystal
display apparatuses, or organic light emitting display apparatuses,
have become more widely used due to their small size, light weight
and low-power-consumption.
A liquid crystal display apparatus applies a voltage to a specific
molecular arrangement to change that molecular arrangement. A
liquid crystal display apparatus displays an image due to changes
in optical properties, such as birefringence, rotatory
polarization, dichroism or light scattering, of a liquid crystal
cell due to changes in the molecular arrangement.
A liquid crystal display apparatus includes a light source, a light
guide unit which guides light from the light source, and a display
panel that displays an image using light from the light guide unit.
A liquid crystal display apparatus uses a mold frame structure to
hold the light source, the light guiding unit and the display panel
together. Recently, various structures for reducing the thickness
of the display apparatus have been proposed.
SUMMARY
One or more exemplary embodiment of the inventive concept can
provide a thinner display apparatus capable of improving display
quality.
According to an exemplary embodiment of the inventive concept, a
display apparatus includes a display panel, a light guide unit
disposed under the display panel that includes a light incident
surface, an opposite surface opposite to the light incident
surface, side surfaces connecting the light incident surface and
the opposite surface, and a light exiting surface facing the
display panel, and a foam tape attached onto an edge of the light
exiting surface and an edge of a lower surface of the display panel
to fix the display panel and the light guide unit. The foam tape
includes a first adhesive layer, a reflecting layer disposed on the
first adhesive layer, a foam layer disposed on the reflecting
layer, and a second adhesive layer disposed on the foam layer and
attached to the display panel. The foam layer is black
In an exemplary embodiment, the foam tape may include a first foam
tape, a second foam tape, and a third foam tape. The first foam
tape may be attached on an edge of the light exiting surface
adjacent to the opposite surface. The second foam tape and the
third foam tape may be attached on edges of the light exiting
surface adjacent to the side surfaces of the light guide unit,
respectively.
In an exemplary embodiment, one or more of the first foam tape, the
second foam tape, or the third foam tape may further include a blue
layer disposed between the reflecting layer and the first adhesive
layer. The blue layer of the first foam tape may absorb yellow
light.
In an exemplary embodiment, the display apparatus may further
include a light source part that emits light and faces the light
incident surface of the light guide unit, wherein light emitted
from the light source part is guided by the light guide unit and
provided to the display panel; and an optical sheet disposed
between the display panel and the light guide unit. The light
source part may include a first light source and a second light
source arranged in a direction in which the light incident surface
extends. Each of the first and second light sources may include a
light emitting diode, a phosphor layer disposed between the light
emitting diode and the light incident surface that includes a
phosphor, and a body that receives the light emitting diode and the
phosphor layer. The light emitting diode may be located at a
position shifted from a center of the body. Each of the first and
second light sources may include a first lead frame and a second
lead frame, and the light emitting diode may be disposed on the
second lead frame.
In an exemplary embodiment, the foam tape may further include a
fourth foam tape. The fourth foam tape may be attached on an edge
of the light exiting surface adjacent to the light incident
surface.
In an exemplary embodiment, the foam tape may further include a
film base layer between the reflecting layer and the foam layer,
and a protective layer disposed between the foam layer and the
second adhesive layer.
In an exemplary embodiment, the reflecting layer may include a
material that causes diffuse reflection or specular reflection.
In an exemplary embodiment, the display apparatus may further
include a reflecting sheet attached on the side surfaces and the
opposite surface of the light guide unit.
In an exemplary embodiment, the display panel may include a display
area and a peripheral area surrounding the display area. The foam
tape may be disposed to overlap the peripheral area.
According to an exemplary embodiment of the inventive concept, a
display apparatus includes a display panel, a light guide unit
disposed under the display panel that includes a light incident
surface, an opposite surface opposite to the light incident
surface, side surfaces connecting the light incident surface and
the opposite surface, and a light exiting surface facing the
display panel, and a foam tape disposed between the display panel
and the light guide unit, and attached on the display panel and the
light guide unit. The foam tape may include a first foam tape, a
second foam tape, and a third foam tape. The first foam tape may be
attached on an edge of the light exiting surface adjacent to the
opposite surface, and the second foam tape and the third foam tape
may be attached on edges of the light exiting surface adjacent to
the side surfaces of the light guide unit, respectively.
In an exemplary embodiment, the foam tape may include a first
adhesive layer, a reflecting layer disposed on the first adhesive
layer, a foam layer disposed on the reflecting layer, and a second
adhesive layer disposed on the foam layer and attached to the
display panel. The foam layer may be black.
In an exemplary embodiment, the reflecting layer may include a
material that causes diffuse reflection or specular reflection.
In an exemplary embodiment, one or more of the first foam tape, the
second foam tape, or the third foam tape may further include a blue
layer which absorbs yellow light and disposed between the first
adhesive layer and the reflecting layer.
In an exemplary embodiment, the display panel may include a display
area and a peripheral area surrounding the display area. The foam
tape may be disposed to overlap the peripheral area.
In an exemplary embodiment, the display apparatus may further
include a light source part that emits light and faces the light
incident surface of the light guide unit, wherein light emitted
from the light source part is guided by the light guiding unit and
provided to the display panel, and an optical sheet disposed
between the display panel and the light guide unit. The light
source part may include a first light source and a second light
source arranged in a direction in which the light incident surface
extends. Each of the first and second light sources may include a
light emitting diode, a phosphor layer disposed between the light
emitting diode and the light incident surface that includes a
phosphor, and a body that receives the light emitting diode and the
phosphor layer. The light emitting diode may be located at a
position shifted from a center of the body. Each of the first and
second light sources may include a first lead frame and a second
lead frame, and the light emitting diode may be disposed on the
second lead frame.
In an exemplary embodiment, the foam tape may further include a
fourth foam tape. The fourth foam tape may be attached on an edge
of the light exiting surface adjacent to the light incident
surface.
In an exemplary embodiment, the foam tape may further include a
film base layer between the reflecting layer and the foam layer,
and a protective layer disposed between the foam layer and the
second adhesive layer.
In an exemplary embodiment, the display apparatus may further
include a reflecting sheet attached on the side surfaces and the
opposite surface of the light guide unit.
According to embodiments of the present disclosure, first to third
foam tapes are attached to edges of the lower surface of a display
panel, and the display panel and the light guide unit are fixed to
each other by the first to third foam tapes. With this structure, a
slim display apparatus can be realized as compared with a
traditional display apparatus that includes a mold frame between
the display panel and the light guide unit.
In addition, each of the first to third foam tapes includes a foam
layer and a reflective layer, and the reflective layer reflects
light reaching the first to third foam tapes back through the light
guide unit again. Accordingly, a uniform luminance can be provided
for the entire display area. In addition, a black foam layer
absorbs light and can prevent light leakage.
In addition, at least one of the first to third foam tapes includes
a blue layer to reduce color deviation at a specific position.
Accordingly, uniform white light can be provided to the entire
light exiting surface. Thus, the display quality can be
improved.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of a display apparatus
according to an exemplary embodiment of the inventive concept.
FIG. 2 is a plan view of first to third foam tapes 410, 420 and
430, a light guide unit 200 and a light source part 300 of the
display apparatus of FIG. 1.
FIG. 3A is a cross-sectional view taken along a line I-I' of FIG.
1.
FIG. 3B is a cross-sectional view taken along a line II-II' of FIG.
1.
FIG. 4 is a cross-sectional view of the third foam tape 430 of the
display apparatus of FIG. 1.
FIG. 5 is a plan view of first to third foam tapes 510, 420 and
430, a light guide unit 200 and a light source part 300 of a
display apparatus according to an exemplary embodiment of the
inventive concept.
FIG. 6 is a cross-sectional view of the first foam tape 510 of the
display apparatus of FIG. 5.
FIG. 7 is a plan view of first to third foam tapes 510, 520 and
430, a light guide unit 200 and a light source part 300 of a
display apparatus according to an exemplary embodiment of the
inventive concept.
FIG. 8 is a cross-sectional view of a first light source 310 of the
light source 300 of the display apparatus of FIG. 7.
FIG. 9 is a plan view of first to fourth foam tapes 410, 420, 430
and 440, a light guide unit 200 and a light source part 300 of a
display apparatus according to an exemplary embodiment of the
inventive concept.
FIGS. 10A and 10B illustrate color deviation of light emitted to a
light exiting surface of a light guide unit of a display apparatus
according to an embodiment of the present disclosure.
FIG. 11 illustrates a transmittance spectrum of light passing
through a light guide unit.
DETAILED DESCRIPTION
Hereinafter, exemplary embodiments of the inventive concept will be
explained in detail with reference to the accompanying
drawings.
FIG. 1 is an exploded perspective view of a display apparatus
according to an exemplary embodiment of the inventive concept. FIG.
2 is a plan view of first to third foam tapes 410, 420 and 430, a
light guide unit 200 and a light source part 300 of the display
apparatus of FIG. 1. FIG. 3A is a cross-sectional view taken along
a line I-I' of FIG. 1. FIG. 3B is a cross-sectional view taken
along a line II-II' of FIG. 1. FIG. 4 is a cross-sectional view of
the third foam tape 430 of the display apparatus of FIG. 1.
Referring to FIGS. 1, 2, 3A and 3B, a display apparatus according
to an embodiment includes a display panel 100, an optical sheet
110, a light guide unit 200, a light source part 300, a first foam
tape 410, a second foam tape 420, and a third foam tape 430.
According to exemplary embodiments, the display panel 100 includes
a lower substrate on which are disposed a plurality of thin film
transistors and signal wirings electrically connected to the thin
film transistors, an upper substrate opposite to the lower
substrate, and a liquid crystal layer disposed between the lower
substrate and the upper substrate.
According to exemplary embodiments, the optical sheet 110 is
disposed under the display panel 100. The optical sheet 110
improves optical characteristics of the display and includes a
diffusion sheet, a prism sheet, etc. The optical sheet 110 is
disposed in a space formed by the first to third foam tapes 410,
420, and 430 between the display panel 100 and the light guide unit
200.
According to exemplary embodiments, the light guide unit 200 is
disposed under the display panel 100 and the optical sheet 110. The
light guide unit 200 guides light emitted from the light source
part 300 to the display panel 100. The light guide unit 200
includes a light incident surface 201 that faces the light source
300, an opposite surface 202 that faces the light incident surface
201, side surfaces 203 connected to the light incident surface 201
and the opposite surface 202, a light exiting surface 204 that
faces the display panel 100, and a reflective surface 205 opposite
from the light exiting surface 204. The light incident surface 201
and the opposite surface 202 extend in a first direction D1. The
side surfaces 203 extend in a second direction D2 which is
substantially perpendicular to the first direction D1.
According to exemplary embodiments, a reflecting sheet 210 is
attached onto the side surfaces 203 and the opposite surface 202 of
the light guide unit 200. The reflecting sheet 210 is a white
reflective tape that causes diffuse reflection. Alternatively, the
reflecting sheet 210 may be a silver (Ag) reflective tape that
causes specular reflection. The light reflected by the side
surfaces 203 and the opposite surface 202 is reflected by the
reflecting sheet 210 back into the light guide plate 200.
According to exemplary embodiments, the light source part 300 faces
the light incident surface 201 of the light guide unit 200. The
light source part 300 includes a plurality of light sources. For
example, the light source part 300 includes a first light source
310 and a second light source 320. Each of the first and second
light sources 310 and 320 are LED packages that include an LED
(light emitting diode) and a phosphor layer.
According to exemplary embodiments, the first foam tape 410, the
second foam tape 420 and the third foam tape 430 are attached onto
a boundary of the light exiting surface of the light guide unit
200. Thus, the first to third foam tapes 410, 420 and 430 are
disposed in a peripheral area PA adjacent to a display area DA of
the light guide unit 200 in which an image is displayed.
According to exemplary embodiments, the first foam tape 410 is
attached onto the light exiting surface of the light guide unit 200
adjacent to the opposite surface 202 of the light guide unit 200.
Thus, in a plan view, the first foam tape 410 is attached onto an
upper edge of the light exiting surface, as shown in FIG. 2.
According to exemplary embodiments, the second foam tape 420 is
attached onto the light exiting surface of the light guide unit 200
adjacent to one of the side surfaces 203 of the light guide unit
200. Thus, the second foam tape 420 is attached onto a left edge of
the light exiting surface, as shown in FIG. 2.
According to exemplary embodiments, the third foam tape 430 is
attached onto the light exiting surface of the light guide unit 200
adjacent to the other of the side surfaces 203 of the light guide
unit 200. Thus, the third foam tape 430 is attached onto a right
edge of the light exiting surface, as shown in FIG. 2.
According to exemplary embodiments, the first foam tape 410, the
second foam tape 420, and the third foam tape 430 are attached to
edges of a lower surface of the display panel 100, so that the
display panel 100 and the light guide unit 200 can be fixed to each
other. With this structure, a slim display apparatus can be
realized as compared with a display apparatus that uses a mold
frame between a display panel and a light guide unit.
Referring to FIG. 4, according to exemplary embodiments, the third
foam tape 430 includes a first adhesive layer 431, a reflecting
layer 432, a film base layer 433, a foam layer 434, a protective
layer 435 and a second adhesive layer 436. A cross-sectional
structure of the first foam tape 410 and the second foam tape 420
is substantially the same as a cross-sectional structure of the
third foam tape 430. Therefore, only the third foam tape 430 will
be described in detail.
According to exemplary embodiments, the first adhesive layer 431 is
attached on the light guide unit 200. The first adhesive layer 431
adheres the third foam tape 430 to the light guide unit 200.
Material constituting the first adhesive layer 431 is not
particularly limited. For example, the first adhesive layer 431 may
contain a pressure-sensitive adhesive. The pressure-sensitive
adhesive may be an acrylic pressure-sensitive adhesive, a rubber
pressure-sensitive adhesive, a silicone pressure-sensitive
adhesive, etc.
According to exemplary embodiments, the reflecting layer 432 is
disposed on the first adhesive layer 431. The reflecting layer 432
reflects light arriving at the third foam tape 430 back through the
light guide unit 200. Light absorbed by the first to third foam
tapes 410 can reduce the intensity of light at an edge portion of
the display area DA adjacent to the peripheral area PA. In a
present exemplary embodiment, light is reflected by the reflecting
layer 432 back into the light guide unit 200 to ensure a more
uniform luminance over the entire display area DA.
According to exemplary embodiments, the reflecting layer 432
includes a material that causes diffuse or specular reflection. For
example, the reflecting layer 432 may be a white reflective layer
that causes diffuse reflection. Alternatively, the reflecting layer
432 may be a silver (Ag) reflective layer that causes specular
reflection. A silver (Ag) reflective layer is formed by coating the
film base layer 433. If the reflecting layer 432 is a silver (Ag)
reflective layer that causes specular reflection, the display
quality improvement effect can be greater than when the reflecting
layer 432 causes diffuse reflection. This is because when the
reflecting layer 432 causes diffuse reflection, brightness may be
increased at an edge portion of the display region DA, which can
reduce the uniformity of the brightness throughout the display
region DA.
According to exemplary embodiments, the film base layer 433 is
disposed on the reflecting layer 432. The film base layer 433 is a
transparent film. For example, the film base layer 433 may be a
resin film such as a polyethylene terephthalate film.
According to exemplary embodiments, the foam layer 434 is disposed
on the film base layer 433. The foam layer 434 includes foamed
polyurethane. The foam layer 434 is black. Thus, since black
absorbs and blocks light, it is possible to prevent light emitted
through the light exiting surface of the light guide unit 200 from
propagating through the first to third foam tapes 410, 420, and 430
in the peripheral area PA.
According to exemplary embodiments, protective layer 435 is
disposed on the foam layer 434. The protective layer 435 is formed
on an upper surface of the foam layer 434. Thus, it is possible to
prevent the foam layer 434 from being damaged when the display
panel 100 is detached from the third foam tape 430 for rework after
bonding.
According to exemplary embodiments, the second adhesive layer 436
is adhered to the display panel 100. The second adhesive layer 436
adheres the third foam tape 430 to the display panel 100. Material
constituting the second adhesive layer 436 is not particularly
limited. For example, the second adhesive layer 436 may contain a
pressure-sensitive adhesive. The pressure-sensitive adhesive may be
an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive
adhesive, a silicone pressure-sensitive adhesive, etc.
FIG. 5 is a plan view of first to third foam tapes 510, 420 and
430, a light guide unit 200 and a light source part 300 of a
display apparatus according to an exemplary embodiment of the
inventive concept. FIG. 6 is a cross-sectional view of the first
foam tape 510 of a display apparatus of FIG. 5.
Referring to FIGS. 5 and 6, according to exemplary embodiments, a
display apparatus of FIGS. 5 and 6 is substantially same as a
display apparatus of FIG. 1, except for a first foam tape 510.
Therefore, a repeated description will be omitted.
According to exemplary embodiments, a display apparatus includes a
display panel, an optical sheet, a light guide unit 200, a light
source part 300 that includes first and second light sources 310
and 320, a first foam tape 510, a second foam tape 420 and a third
foam tape 430.
According to exemplary embodiments, the first foam tape 510 is
attached onto a light exiting surface of the light guide unit 200
adjacent to an opposite surface of the light guide unit 200. Thus,
the first foam tape 510 is attached onto an upper edge of the light
exiting surface, as shown in FIG. 5.
According to exemplary embodiments, the first foam tape 510
includes a first adhesive layer 511, a blue layer 517, a base layer
518, a reflective layer 512, a film base layer 513, a foam layer
514, a protective layer 515, and a second adhesive layer 516.
According to exemplary embodiments, the first adhesive layer 511 is
attached onto the light guide unit 200. The first adhesive layer
511 adheres the first foam tape 510 to the light guide unit 200.
Material constituting the first adhesive layer 511 is not
particularly limited. For example, the first adhesive layer 511 may
be a pressure-sensitive adhesive. The pressure-sensitive adhesive
may be an acrylic pressure-sensitive adhesive, a rubber
pressure-sensitive adhesive, a silicone pressure-sensitive
adhesive, etc.
According to exemplary embodiments, the blue layer 517 is disposed
on the first adhesive layer 511. The blue layer 517 absorbs yellow
light. The blue layer 517 may be formed by printing or coating a
blue ink on the base layer 518.
According to exemplary embodiments, light emitted from the light
source part 300 is white light. When white light propagates through
the light guide unit 200, short wavelength blue light is absorbed
by the light guide unit 200, and the white light changes to yellow
light, as shown in FIG. 11. This is more apparent with increasing
distance through the light guide unit 200, and white light appears
yellowish at the opposite surface of the light guide unit 200 far
from the light source part 300. The blue layer 517 below the
reflecting layer 512 of the first foam tape 510 absorbs yellow
light, which reduces the yellowish phenomenon, so that a more
uniform white light can be provided to the entire display area DA
of the display apparatus. Accordingly, display quality can be
improved.
According to exemplary embodiments, the base layer 518 is disposed
on the blue layer 517. The base layer 518 is a transparent film.
For example, the base layer 518 may be a resin film such as a
polyethylene terephthalate film.
According to exemplary embodiments, the reflecting layer 512 is
disposed on the base layer 518. The reflecting layer 512 reflects
light arriving at the first foam tape 510 back through the light
guide unit 200.
According to exemplary embodiments, the reflecting layer 512
includes a material that causes diffuse reflection or specular
reflection. For example, the reflecting layer 512 may be a white
reflective layer that causes diffuse reflection. Alternatively, the
reflecting layer 512 may be a silver (Ag) reflective layer that
causes specular reflection. The silver (Ag) reflective layer can be
formed by coating the base layer 518.
According to exemplary embodiments, the film base layer 513 is
disposed on the reflecting layer 512. The film base layer 513 is a
transparent film. For example, the film base layer 513 may be a
resin film such as a polyethylene terephthalate film.
According to exemplary embodiments, the foam layer 514 is disposed
on the film base layer 513. The foam layer 514 includes foamed
polyurethane. The foam layer 514 is black. Thus, since black
absorbs and blocks light, it is possible to prevent light emitted
through the light exiting surface of the light guide unit 200 from
propagating through the first to third foam tapes 510, 420, and 430
in the peripheral area PA.
According to exemplary embodiments, the protective layer 515 is
disposed on the foam layer 514. The protective layer 515 is formed
on an upper surface of the foam layer 514. Thus, it is possible to
prevent the foam layer 514 from being damaged when the display
panel 100 is detached from the first foam tape 510 for rework after
bonding.
According to exemplary embodiments, the second adhesive layer 516
is adhered to the display panel 100. The second adhesive layer 516
adheres the first foam tape 510 to the display panel 100. Material
constituting the second adhesive layer 516 is not particularly
limited. For example, the second adhesive layer 516 may contain a
pressure-sensitive adhesive. The pressure-sensitive adhesive may be
an acrylic pressure-sensitive adhesive, a rubber pressure-sensitive
adhesive, a silicone pressure-sensitive adhesive, etc.
According to exemplary embodiments, the second and third foam tapes
420 and 430 of FIG. 5 are substantially same as the second and
third foam tapes of the display apparatus of FIG. 1. Therefore, a
repeated description will be omitted.
FIG. 7 is a plan view of first to third foam tapes 510, 520 and
430, a light guide unit 200 and a light source part 300 of a
display apparatus according to an exemplary embodiment of the
inventive concept. FIG. 8 is a cross-sectional view of a first
light source 310 of the light source 300 of a display apparatus of
FIG. 7.
Referring to FIGS. 7 and 8, according to exemplary embodiments, a
display apparatus of FIGS. 7 and 8 is substantially same as a
display apparatus of FIG. 5, except for first and second light
sources 310 and 320 of the light source part 300, and a second foam
tape 520. Therefore, a repeated description will be omitted.
According to exemplary embodiments, a display apparatus may include
a display panel, an optical sheet, a light guide unit 200, a light
source part 300 that includes first and second light sources 310
and 320, a first foam tape 510, a second foam tape 520 and a third
foam tape 430.
According to exemplary embodiments, the second foam tape 520 has
substantially the same structure as the first foam tape 510 of a
display apparatus of FIGS. 5 and 6. That is, the second foam tape
520 includes a first adhesive layer, a blue layer, a base layer, a
reflective layer, a film base layer, a foam layer, a protective
layer, and a second adhesive layer.
According to exemplary embodiments, the first light source 310 is
an LED package. The first light source 310 includes a light
emitting diode chip (LED), a bonding wire (WR), a first lead frame
LF1, a second lead frame LF2, a body that includes a bottom portion
312 and a side wall portion 314, and a phosphor layer 316.
According to exemplary embodiments, the body includes an insulating
material such as polyphthalamide (PPA) or epoxy resin. The light
emitting diode chip LED and the phosphor layer 316 are disposed in
a space formed by the bottom portion 312 and the side wall portion
314. Accordingly, the phosphor layer 316 is disposed between the
light emitting diode LED and a light incident surface of the light
guide unit 200. The light emitting diode LED is disposed on the
second lead frame LF2. The first lead frame LF1 and the light
emitting diode LED are electrically connected by the bonding wire
WR. The second lead frame LF2 and the light emitting diode LED are
electrically connected by the bonding wire WR. The phosphor layer
316 includes a phosphor.
According to exemplary embodiments, light emitted from the light
emitting diode LED propagates through the phosphor layer 316 and
into the light incident surface of the light guide unit 200. At
this time, the light propagating through the phosphor layer 316 and
incident onto the light incident surface is white light. There are
various configurations of the phosphors of the phosphor layer 316
and the light emitting diode LED for emitting white light. For
example, the light emitting diode LED may generate blue light, and
the phosphor layer 316 may include a yellow phosphor.
According to exemplary embodiments, the second light source 320 is
substantially the same as the first light source 310 and is
adjacent to and spaced apart from the first light source 310 in the
first direction D1.
According to exemplary embodiments, the light emitting diode LED is
not disposed at a center of the bottom portion 312 but rather is
shifted toward one side in the first direction D1 for convenience
of manufacturing the first light source 310. Accordingly, the light
emitting diode LED is not located at a center of the phosphor layer
316, and light emitted from the first light source 310 can have a
right-left color deviation, as illustrated in FIGS. 10A and
10B.
According to exemplary embodiments, right-left color deviation of
the display area of a display apparatus occurs due to right-left
color deviation of the first and second light sources 310 and 320.
However, according to a present embodiment, since the second foam
tape 520 includes a blue layer that can reduce the color deviation,
and the third foam tape 430 does not include the blue layer,
uniform white light can be provided to the entire display area.
Thus, the display quality can be improved.
FIG. 9 is a plan view of first to fourth foam tapes 410, 420, 430
and 440, a light guide unit 200 and a light source part 300 of a
display apparatus according to an exemplary embodiment of the
inventive concept.
Referring to FIG. 9, according to exemplary embodiments, a display
apparatus is substantially same as a display apparatus of FIG. 1,
except that the display apparatus further includes a fourth foam
tape 440. Therefore, a repeated description will be omitted.
According to exemplary embodiments, the fourth foam tape 440
adheres to a light exiting surface of a light guide unit 200
adjacent to the light incident surface 201 of the light guide unit
200 shown in FIG. 3B. Thus, in a plan view, the first foam tape 410
is attached to a lower edge of the light exiting surface.
According to exemplary embodiments, one or more of the first to
fourth foam tapes 440 may further include a blue layer, such as
layer 517 in FIG. 6, to compensate for color deviation.
FIGS. 10A and 10B illustrate color deviation of light emitted to a
light exiting surface of a light guide unit of a display apparatus
according to an embodiment of the present disclosure.
FIG. 10B depicts a plurality of measurement points on a light
exiting surface of a light guide unit. The Cy measured values at 13
points are shown in FIG. 10A. X-axis in FIG. 10A represents the
measurement point, and y-axis represents the Cy value. The Cy value
is a Cy value of color coordinates. Right-left color deviation,
measurement points 1 and 3, and measurement points 11 and 13, and
color deviation, measurement points 2 and 12, between light
incident and exiting surfaces are shown in the drawing.
FIG. 11 illustrates a transmittance spectrum of light propagating
through the light guide unit, according to embodiments of the
disclosure. As the light propagates through the light guide unit,
the short wavelength portion is absorbed by the light guide unit,
and the emitted light becomes yellowish.
According to embodiments of the present disclosure, first to third
foam tapes are attached to edges of the lower surface of a display
panel, and the display panel and the light guide unit are fixed to
each other by the first to third foam tapes. With this structure, a
slim display apparatus can be realized as compared with a
traditional display apparatus that uses a mold frame between a
display panel and a light guide unit.
In addition, according to exemplary embodiments, each of the first
to third foam tapes includes a foam layer and a reflective layer,
and the reflective layer reflects the light arriving at the first
to third foam tapes back through the light guide unit. Accordingly,
a more uniform luminance can be provided to the entire display
area. In addition, the black foam layer absorbs light and prevents
light leakage.
In addition, according to exemplary embodiments, at least one of
the first to third foam tapes includes a blue layer that
compensates for color deviation at a specific position.
Accordingly, a more uniform white light can be provided to the
entire light exiting surface. Thus, the display quality can be
improved.
The foregoing is illustrative of exemplary embodiments of the
inventive concept and is not to be construed as limiting thereof.
Although a few exemplary embodiments of the inventive concept have
been described, those skilled in the art will readily appreciate
that many modifications are possible in exemplary embodiments
without materially departing from the novel teachings and
advantages of the inventive concept. Accordingly, all such
modifications are intended to be included within the scope of the
inventive concept as defined in the claims. Therefore, it is to be
understood that the foregoing is illustrative of the inventive
concept and is not to be construed as limited to the specific
exemplary embodiments disclosed, and that modifications to the
disclosed exemplary embodiments, as well as other exemplary
embodiments, are intended to be included within the scope of the
appended claims. The inventive concept is defined by the following
claims, with equivalents of the claims to be included therein.
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